<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        123

        {{test}}
        <br>
        {{num}}
        <br>
        {{bol}}
        <br>
        {{test1}}
    </div>


    <script src="./vue.js"></script>
    <script>
        let myApp = new Vue({
            el: '#app',
            data: {
                test: 'this is my first msg',
                num: 100,
                bol: true,
                test1: undefined
            }
        })
    </script>



</body>
</html>